中文摘要：

基于热传导理论和实验相结合研究了连续CO2激光辐照Ge20Sb15Se65硫系玻璃作用下的损伤特性和机理。研究表明：Ge20Sb15Se65玻璃在高功率密度的CO2激光作用下,会出现陨石凹坑、微裂纹和空洞等损伤特征,其原因在于杂质吸收和多声子过程引起的热积累作用导致样品表面温度急剧升高,使得玻璃中熔点较低的Se元素组分气化蒸发,导致玻璃材料分解。当样品的光吸收系数为0.013 cm^-1,厚度为3 mm时,玻璃损伤阈值为74.3 kW/cm^2,实验结果与数值分析基本相符。

英文摘要：

Damaging characteristic of continuous wave（CW） CO2 laser to Ge-Sb-Se chalcogenide glass is studied based on the thermal conduction and experimental study. Studies show that the laser induced damage is mostly damage when heat accumulation causing temperature rising exceeds decomposition temperature of glass. Damage characteristics include meteorite pits, micro-cracks and holes. Se substance is vaporized because of its low melting points, accordingly glass is decomposed in irradiation area. For a Ge-Sb-Se glass of 3 mm thickness, its absorption coefficient is 0.013 cm^-1, the sample may be induced damage by a laser irradiation of 74.3 kW/cm^2, which is basically consistent with numerical analysis results.